rest api version bumped for async pre live migration checks

pre live-migration checks now are done in async way. This patch
updates rest api version to keep this tracked.

bp: async-live-migration-rest-check

Change-Id: I9fed3079d0f1b7de3ad1b3ecd309c93785fd11fe

nova/api/openstack/api_version_request.py

@@ -83,6 +83,10 @@ REST_API_VERSION_HISTORY = """REST API Version History:
     * 2.32 - Add tag to networks and block_device_mapping_v2 in server boot
              request body.
     * 2.33 - Add pagination support for hypervisors.
+    * 2.34 - Checks before live-migration are made in asynchronous way.
+             os-Migratelive Action does not throw badRequest in case of
+             pre-checks failure. Verification result is available over
+             instance-actions.
 """
 
 # The minimum and maximum versions of the API supported
@@ -91,7 +95,7 @@ REST_API_VERSION_HISTORY = """REST API Version History:
 # Note(cyeoh): This only applies for the v2.1 API once microversions
 # support is fully merged. It does not affect the V2 API.
 _MIN_API_VERSION = "2.1"
-_MAX_API_VERSION = "2.33"
+_MAX_API_VERSION = "2.34"
 DEFAULT_API_VERSION = _MIN_API_VERSION